readme updated

Author: Cook21

README.md

@@ -1,5 +1,7 @@
 # Modified CameraXBasic
-This is a modified version of the Google CameraX sample
+This is a modified version of the Google CameraX sample.
+All photos are located under /Android/media/com.android.example.cameraxbasic/CameraX Basic, this directory will be 
+deleted if you uninstall this app, proceed with caution.
 ## Features
 * Add support for zoom and tap-to-focus
 * Remove ImageAnalyzer